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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1acd4d156c66e5da90f389eadde74b72ce8f3af91f3f5527c9dcb0faa6eb735' 
  AND token = 'NRIHZ7prNgAURkEd+8zNQ8fiBwX4GWOX+KwFcBpI21Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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