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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442a2588d2c7c79ffd1befb5b7b0b443cbb31d08d06446e4153516b7239bf0e3' 
  AND token = 'AFfykPDGtc3BkqWncbqYHujqPyCKNtrGspCY4V8m8MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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