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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbc78ab45a1c3632b887fe7b53c1a806e798b0b197aa03c9761d171790fe316' 
  AND token = 'mVlzA94FIeWxWDTEVFRwAOFACqs65VCOPiBtoccdw5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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