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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f52310200dbd3f17a359abaea8445cbbfee886ed40decc403a72a8936fe4d43' 
  AND token = 'f+HlhZc+oMfXxyiy7rnl9QeB+P7/wFds4nECSrsAPPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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