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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a988dada60d2581b6784ec5550e208a2257be16d24a647c91daeac27dbd6d53' 
  AND token = 'jZ3Az4iNYdsd90ofR451m+BcXspUYMBR3OChxjIMI1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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