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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e6ff169b4554bd30028078426c440b46fbc2c7b8dc14b13dfc1e036d3359d3' 
  AND token = 'br55k2PHw5RokTQ6Gk+vZI7CsV30ks+0tNpBAC7SP8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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