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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062c18acd9161a4ae919dd506ce5bf0e12b3d6589a4c7856fff7b56f0e2f9c9b' 
  AND token = 'dLLQMaTsxkyd+Nca41BIOy5kinaNye06GPS8GGwxFCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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