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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a682edd3a5ef518190dc300d0d41c4a6e2bc9c096d47ed7d1a26d6c5fc606df0' 
  AND token = 'KG8DMRJQZgjgqOYmrMw3+uOAfDb060NjVOcOUQ6EhF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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