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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa6d187ae3c0cd9a9a2777215b8399430aaa3dd9ec3b027909e351b95c4ac28' 
  AND token = 'qzfAkHm8zCWw8OIVMJRpVOd7Fh9nrub8/q2RycdUefM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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