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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb26941dbc85e0dcae35c4debde2acf5c9d0393c66368182d45101e02ecdd1f6' 
  AND token = 'GXC2YhAxTLCD8Y5njZdALVRlJKZU55TuA+UmJqSAZXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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