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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5325ea27ae4ca73286434b472a5153557fdaf1aacd5ef282b18271443a4d6c42' 
  AND token = 'JF2/uaKuMiESBzx9i5RW+G571Nv+MDdK2dNUgJesGow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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