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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5449eafe9d7f68ae887e0574ecc842ab32b07a6c5f97bb37a13a67cd77692a4' 
  AND token = '5QGAhOPq37g4bZ7hGWf4qkfZeC9zubmRGvDhEOBNXxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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