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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8838af33c10d9885076902cc54d3ad3c9655ac0cae28949c29bb85ce8f79946' 
  AND token = 'NJlat5M2yd50DARzLiTNUYdUjE1zl45iIHSPz7Syacc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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