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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f19d9ccb97270a5d6f0d8a4b97fad58681c6e8e8ebc3aeaafbc3ebc10556f2' 
  AND token = 'sc5mPYHOQChRHrxwbvnbTR/zaU3pOwhb9rcmSO0CLOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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