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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659ee9e9246f5e314369c72e088431beecf31da3e1796171ff93c3a20d5a5024' 
  AND token = 'lzab5mkD7CkgTnsi+3HMZJHrs/A490RBh26h6AcT+HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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