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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1da3b2a7c67ec03c04a293a607ee7229d6f10427526f6e8e92a582aad0b1a2c' 
  AND token = 'p/J7xuTiFL0THVVLehKprglWTebP9QqGxP4KPXFwGis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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