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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54f40be8655764d191a6a538bfb81975a126e6522003c39d27339f34cf82d45' 
  AND token = '5ydM6ChQg3tXWtreZi4gCEjjHfbWOsb5fTiyX4TGu5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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