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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7befcaa4847d5f3776a8b7171d51557b3ab5fd652265cfb511978c68a10fd85f' 
  AND token = 'tbAtpDl7U7V5XHDMsEyPLpHMJu07VAo7uye4Bla3/qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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