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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9823295d0e63bbabca3d1d97d4271403744a6e9d89235faf4d170f0053cec46f' 
  AND token = 'TIgrHHqaosL6HRtbUQC0gXxr6FBRoRRuxwUQTZBYUis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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