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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ebb95f510ac4636e8ea815e8d1226eac64bf9d3cdd3583f21a2ceb22d3b3e5f' 
  AND token = 'h4H3jgEvpBBfd7OF9+D++Hy9SPijAV6gBgYY3yc31gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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