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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc4f773d4ae464f56664a721c4259b9fc95c11fb31ee91659e1fa00db825507' 
  AND token = '+ebYmnu2jD3M5tK0/QU5GAGZ/XVYBF647ky2jMYW+dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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