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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c119d667cc1755c52b5b0de466fba29d40bf3e1099b16dc4c9cff515717219de' 
  AND token = '/FTIRQ95/WGHP3SR2QpDCc1WFycZdMN/2WrFP2PNVGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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