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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbed1c1e4b52dbe23ebf86c8dd7306c965b5e937f71edbd25d2ec407f71400ce' 
  AND token = 'wp4bqY2LM95DzJK6my+QzwGxUyn7GWntkPjjaalhSkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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