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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '258b4c5531c8e4e5b0bd05332d70a861e8be234247cfdd88e3c3aafb5bf82e67' 
  AND token = 'p7S54DWUqVC9sVMpm8Gr+AZj4uKQ1PennXZr+TXHt+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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