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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b96097993489089a89d509a31c0311cbcaa8c568530e94701baee55f3fdd28e' 
  AND token = 'Ktjj9lAVOwzdAxwsf9SOr8/zBvZFRRnH6i70u9B+Rlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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