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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3160383706695e94ca65ac0e3f9251206fb5756c7e8acd0a89c9855a19c26c' 
  AND token = 'rQyaj8nUbtANeznHjENCAyJ/XeEcde5HiZNd+hIGfQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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