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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4dff53c238e64dbac79ff8cf4c4f8c4a160579b61fb14abb948ecf8b282d36' 
  AND token = '4DxHCujbXKD+17mgn6mLSHyL3wCgtl65tJi8v4PEiPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}