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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150ccb29aab00b1022608ac0a309b883d13f6e3a2ff89a1e6e12c37f48434e8c' 
  AND token = 'U+lky0Sav/AqsB3M9PRTBLF0xNySXRO03cu6PPRT0eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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