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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8faead357092a26fd77d2a23b33234b93891cff8d4d8f38309065f6574d793d' 
  AND token = 'ksG6pdtiam83r5o3jGD6DVDQN5eln8eH4/FbItXx+vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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