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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7e56366cb516811b608c97b505e54cbb6babf6be5b13e5a2e5452c9c959a66' 
  AND token = 'SARFc2rHk0dR/dw1a3E15cyJQb3IS4rtgzhJ1aeCbBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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