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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c362096505d7a93f9b0a1ee1a5ed74b5ce53b54a4418ad9cd813f96452f6f601' 
  AND token = 'Gp4IYcZtnsXGlDfTJpu4OHf4P0EXFFYAAsBb4nsZkpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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