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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418f0c879bba081d78de498c447f0786144e1703a5e3a280e226c7daa5c686de' 
  AND token = 'oWrY5D3KQ/0FjrrWw7bur2GVEwG4Ct7LYJcnnsLdsNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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