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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ca796ed0682d5a033519e22e4ed2215d24e1ef6d8c14b42d52cc9b6f0c5868' 
  AND token = 'kAeaztHFeMKCWFv1ldNZjZC3xkEFdFEjAMFOzfediUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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