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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfb3d23c12021f1d709ce71fd090beb34e40233a52dd90dc5fd14c5c9adc821' 
  AND token = 'MuFLC6ExMjVO+STSqs048dR/I6DLH0lidFgB/5g840g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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