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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac7276f8e024ecc7643c88aac185ab2b57838bb1983e85008ecd8e4f3a107e5' 
  AND token = 'z0ZgwML8zewsP9C7UjzpxeGQXoIp6DC6H/47svxEC+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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