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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92af384ccb726f8f6e85530ba56f3880909d702f31b08f15ca0996805ee6fda1' 
  AND token = 'wCvPP77Dywzr0V/USCdd6NPe0c1OkiRysiifECOMmQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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