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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a2428868307f8ea0b6638689a94095b48589137798794e3f3216901633aec3' 
  AND token = '6xffuqYB3hx+Ou2SgoDKKUUeC4RC0VpInwu2i4LTCm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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