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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ca3bfddac7ce1016621a765971d152cfdd80630f01cc6df4a008e534209c83' 
  AND token = 'HRQHTEXW27t7Drbd2k7MEw8xvGnkXsXm0TihQj4f+3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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