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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeeb365fb9bcd8e93af5ceb2888a7f976452853caf84d2a32930b624f65c7a6f' 
  AND token = '7lXnI3a1LiO7EnHtZaWMi+yjgk46g3b+XHdMZ1D0tm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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