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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86596567b26aa5e5ee28eef06e9fc7afec460fa6a2a5f2ffe082156842ace5f7' 
  AND token = '5dd7sWXQnqpSqz5LqBaJADUV+GBLsWqvmWgLmYik5cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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