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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17561ed38ac79242a36cd2370918978bee92d5e4af3ad9af7e9f475977f27efe' 
  AND token = 'VstSlKi6pIrHfl11Gx87zplzGXvKmeUURMG5w7M6uN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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