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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f2fcb9ff06ee6bb0a5398018b265938cc8f50ba88e17cb535c5fc5ef7c02ca' 
  AND token = 'nb+/q5aWH3oaRp1g5E3uGoi+5vqqnTaCYMymNz49oeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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