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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1f05a009a8cbbbd87452cb6f611ff2e4873cb0370f9cd0588ddaf3b007992f' 
  AND token = 'Obt5lgFWNW07yI4VxvhZRKE+3prAP7fMGN16NEpQ/jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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