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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03cec2750cb8dea312f5dcf6c1e428c2bb28548d22d56d5d299f06c9233bd3a' 
  AND token = '0TIjg/IhstKScWfaIelfrzuiAJYi6Qjx3Z2p0eyTEoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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