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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af52ae9c5cd490a28a6bbc312497d138f9e2b1ff2ee37722ca0b02b222e8df3' 
  AND token = 'w4TAmRyUCbd03KAg12qlqZorjENrcH2DiRSt1UN1agQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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