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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ed35dccb3f451d229fc5df8581c39d11c9db2c0763517c8ec92fb4318798f3' 
  AND token = 'fwImrUnzTci95PLKVlV3E0/Rg3C8/MLVcr/wLb8SA6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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