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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934cfdca9194d3dfdc49ed4f2d748d933b5e44bb049603938c07f94ebdfc9682' 
  AND token = 'Fvypr3E1Jt+tkLEGLCciIDEgGxO30HWG1qAD13EbVsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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