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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f677351bb064cb57ddcb5c7df6fa37e673dd4d54826ba7f6019a19eb6f52dbac' 
  AND token = 'P/bWFetomTNS5qK72CRvIZGCJ22GgW/6deV+HjUFQ00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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