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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7a9dac6bac910c9a8fae6813edb4d3d2037d0f2b0e8560a340aa39645ae864' 
  AND token = '17KozfHrPjNy39A4omtAXtn+vTRdNpJKORW9VSmYt+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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