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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c7e7f2da1afef1ae3d594e33e48ef16d16b11db6bc329b3cd1cf94392ed8db' 
  AND token = 'N1tu9B/4kvkvXpl/x9TvUZvx65qlO9W97fTH09y5NPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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