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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5193fc2a23c9f88a9773478567c97905c5b6ae0f47f792e66710cbf0e605cd44' 
  AND token = 'trdahvJdd0gkzahmCWu1KdogJpTlzPrRFBn1HHE1foQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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