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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00ecebb40fe09568b7ee0ad06b053f6b4ce1469535a7c69a644d19d4db7c4d5' 
  AND token = 'beoOO+L06UY+wFWbOTM6Vs9za7umQhSSbEgHRMR7H1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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