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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac2c11a00b2d643e0312bf27da75c4758aa84e1dc0c9a40987d69d22eeb7a2c' 
  AND token = 'OB39hFVJX4y9Xo5C6N3DfT+5eHX9zC8Pjx6AhgWdzGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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