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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255b2f7173157a606b1bdbca2fd08a8298e15783b8f4222506626f4780632827' 
  AND token = 'WkAsTW9BdjdRn4UaoXvkq7sVFq+dSR0fSIek57wmmlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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