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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1b7cdd53d36da40a096d74e888af0b6dcb5ba6931ef04adf354692edf8ddff' 
  AND token = 'pQ+AHPqvztj0pCHrE96PFFWWLY6bokVPlgRMnOovefc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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