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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e18eb383bb1d734b222d10af5f059b82c18f36a8bc4e44cec7f49dff2c3711' 
  AND token = 'Wyh6Qu670gzgCwpEuo74i73PO2JWlPn60/9OXaSlSYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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